That's an access point rather than a router - so does that mean your superhub is still in full router mode rather than modem mode, with just Wifi switched off?
Im in the same boat and got one of these:
Are you with Virgin? I can get almost 60mbps wired but their router is terrible and I can't get more than 25 with it on wifi.
Don't suppose anyone can recommend a good cheap wifi router I can use?
For the price, you absolutely cant fault it. Quick, good range... everything the shitty superhub isnt.